Update #2: a few days later and the unit has been replaced by Clore, with a prepaid label to send the defective unit to their engineering department to determine the mode of failure. I'm very pleased with the customer service over Schumacher, so much so that I decided to start replacing my DSR products with Clore and Solar products. Very happy, support is one of my highest priorities during purchases as a technician. The new unit arrived better packaged I would like to add, with more cushioning and bubble wrap.
Update: a relay on the output is defective, and only works if the unit is tapped after being turned on. This thing came packaged very poorly and it is almost certainly damaged because of it combined with Amazon's careless drivers. I'm very disappointed in both the manufacturer and Amazon delivery.
Original review Aug 22-2020: So the first thing I noticed, is how poorly packaged this unit was, allowing it to get dented and have parts come loose from inside. The plastic in the photo (excuse the dirty hands) was loose inside the charger. It was held down by hot glue, to say I'm concerned is an understatement. I contacted clore automotive through email, so I'll update the review when we reach a conclusion.